Update app/assets/javascripts/ckeditor/config.js

Resolves a syntax issue when disabling uploading of an asset.
When setting the following configuration:

```
config.filebrowserFlashUploadUrl = ''; // Disable Flash Uploading
```
Merge pull request #229 from kylewelsby/patch-1

Resolves a syntax issue when disabling uploading of an asset
Upgrade ckeditor to 4.1 full version
Bump gem version to 4.0.1
Update readme
Merge branch 'master' of github.com:galetahub/ckeditor
Merge remote-tracking branch 'upstream/master'